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Analysis of annual peripheral, abdominal and airway attack frequency (total 323). (a) Peripheral attack frequency. (b) Abdominal attack frequency. (c) Airway attack frequency. The mean annual attack frequency is shown with individual patients on the x-axis and the frequency of attacks on the y-axis; s.d. (d) Average annual attack frequency. The mean overall attack frequency per patient per year at the three main sites of swelling.
